ENS 46279

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v t e ENS Event
07:10 Sep 25, 2010
Title	High Pressure Core Spray System Room Cooling Fans Found Not Operating
Event Description	This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident. During steady state operations 2VD05C, Division 3 Switchgear Room / Core Standby Cooling System (CSCS) Pump Room Supply Fan and 2VD07C, Division 3 Switchgear Room / Core Standby Cooling System (CSCS) Pump Room Return Fan were found not operating. Division 3 ventilation supplies cooling to the High Pressure Core Spray System (HPCS), which is a single-train system. At the time of this discovery, there was not assurance that the HPCS would fulfill its safety function without mitigating manual actions due to the fan failure, and thus this condition is reportable. Operators are now briefed to manually operate the fan if needed to maintain proper temperature conditions until maintenance begins, thus restoring system function. The licensee has notified the NRC Resident Inspector.

ENS 46279 +/-
Where
Lasalle Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
LER:	05000374/LER-2010-001
Time - Person (Reporting Time:+3.23 h0.135 days <br />0.0192 weeks <br />0.00442 months <br />)
Opened:	John Keenan 10:24 Sep 25, 2010
NRC Officer:	Bill Huffman
Last Updated:	Sep 25, 2010
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v • d • e

v t e Emergency Notification System
LaSalle with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2023-04-17T07:46:00 [Table view]
[ENS list for LaSalle]

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